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package common
import (
"fmt"
"math/big"
"os"
"os/user"
"path"
"path/filepath"
"runtime"
"time"
"github.com/kardianos/osext"
)
// MakeName creates a node name that follows the ethereum convention
// for such names. It adds the operation system name and Go runtime version
// the name.
func MakeName(name, version string) string {
return fmt.Sprintf("%s/v%s/%s/%s", name, version, runtime.GOOS, runtime.Version())
}
func DefaultAssetPath() string {
var assetPath string
pwd, _ := os.Getwd()
srcdir := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist")
// If the current working directory is the go-ethereum dir
// assume a debug build and use the source directory as
// asset directory.
if pwd == srcdir {
assetPath = path.Join(pwd, "assets")
} else {
switch runtime.GOOS {
case "darwin":
// Get Binary Directory
exedir, _ := osext.ExecutableFolder()
assetPath = filepath.Join(exedir, "../Resources")
case "linux":
assetPath = "/usr/share/mist"
case "windows":
assetPath = "./assets"
default:
assetPath = "."
}
}
// Check if the assetPath exists. If not, try the source directory
// This happens when binary is run from outside cmd/mist directory
if _, err := os.Stat(assetPath); os.IsNotExist(err) {
assetPath = path.Join(srcdir, "assets")
}
return assetPath
}
func DefaultDataDir() string {
usr, _ := user.Current()
if runtime.GOOS == "darwin" {
return path.Join(usr.HomeDir, "Library/Ethereum")
} else if runtime.GOOS == "windows" {
return path.Join(usr.HomeDir, "AppData/Roaming/Ethereum")
} else {
return path.Join(usr.HomeDir, ".ethereum")
}
}
func FromHex(s string) []byte {
if len(s) > 1 {
if s[0:2] == "0x" {
s = s[2:]
}
if len(s)%2 == 1 {
s = "0" + s
}
return Hex2Bytes(s)
}
return nil
}
func IsWindows() bool {
return runtime.GOOS == "windows"
}
func WindonizePath(path string) string {
if string(path[0]) == "/" && IsWindows() {
path = path[1:]
}
return path
}
// The different number of units
var (
Douglas = BigPow(10, 42)
Einstein = BigPow(10, 21)
Ether = BigPow(10, 18)
Finney = BigPow(10, 15)
Szabo = BigPow(10, 12)
Shannon = BigPow(10, 9)
Babbage = BigPow(10, 6)
Ada = BigPow(10, 3)
Wei = big.NewInt(1)
)
//
// Currency to string
// Returns a string representing a human readable format
func CurrencyToString(num *big.Int) string {
var (
fin *big.Int = num
denom string = "Wei"
)
switch {
case num.Cmp(Douglas) >= 0:
fin = new(big.Int).Div(num, Douglas)
denom = "Douglas"
case num.Cmp(Einstein) >= 0:
fin = new(big.Int).Div(num, Einstein)
denom = "Einstein"
case num.Cmp(Ether) >= 0:
fin = new(big.Int).Div(num, Ether)
denom = "Ether"
case num.Cmp(Finney) >= 0:
fin = new(big.Int).Div(num, Finney)
denom = "Finney"
case num.Cmp(Szabo) >= 0:
fin = new(big.Int).Div(num, Szabo)
denom = "Szabo"
case num.Cmp(Shannon) >= 0:
fin = new(big.Int).Div(num, Shannon)
denom = "Shannon"
case num.Cmp(Babbage) >= 0:
fin = new(big.Int).Div(num, Babbage)
denom = "Babbage"
case num.Cmp(Ada) >= 0:
fin = new(big.Int).Div(num, Ada)
denom = "Ada"
}
// TODO add comment clarifying expected behavior
if len(fin.String()) > 5 {
return fmt.Sprintf("%sE%d %s", fin.String()[0:5], len(fin.String())-5, denom)
}
return fmt.Sprintf("%v %s", fin, denom)
}
// Common big integers often used
var (
Big1 = big.NewInt(1)
Big2 = big.NewInt(2)
Big3 = big.NewInt(3)
Big0 = big.NewInt(0)
BigTrue = Big1
BigFalse = Big0
Big32 = big.NewInt(32)
Big256 = big.NewInt(0xff)
Big257 = big.NewInt(257)
)
func Bench(pre string, cb func()) {
start := time.Now()
cb()
fmt.Println(pre, ": took:", time.Since(start))
}
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